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-rw-r--r--danger/gemfile/Dangerfile15
1 files changed, 15 insertions, 0 deletions
diff --git a/danger/gemfile/Dangerfile b/danger/gemfile/Dangerfile
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index 00000000000..3d38959a9d0
--- /dev/null
+++ b/danger/gemfile/Dangerfile
@@ -0,0 +1,15 @@
+# rubocop:disable Style/SignalException
+
+gemfile_modified = git.modified_files.include?("Gemfile")
+gemfile_lock_modified = git.modified_files.include?("Gemfile.lock")
+
+if gemfile_modified && !gemfile_lock_modified
+ msg = [
+ "#{gitlab.html_link("Gemfile")} was edited but #{gitlab.html_link("Gemfile.lock")} wasn't.",
+ "Usually, when #{gitlab.html_link("Gemfile")} is updated, you should run",
+ "`bundle install && BUNDLE_GEMFILE=Gemfile.rails5 bundle install` or",
+ "`bundle update <the-added-or-updated-gem>` and commit the #{gitlab.html_link("Gemfile.lock")} changes."
+ ]
+
+ warn msg.join(" ")
+end